diff --git a/arch/powerpc/mm/lmb.c b/arch/powerpc/mm/lmb.c
index 4b17a73..716a290 100644
--- a/arch/powerpc/mm/lmb.c
+++ b/arch/powerpc/mm/lmb.c
@@ -320,7 +320,8 @@
 		break;
 	}
 
-	lmb.rmo_size = lmb.memory.region[0].size;
+	if (lmb.memory.region[0].size < lmb.rmo_size)
+		lmb.rmo_size = lmb.memory.region[0].size;
 
 	/* And truncate any reserves above the limit also. */
 	for (i = 0; i < lmb.reserved.cnt; i++) {